The below quote speaks volumes about the mental aspects of running and racing. When racing, your body gets more than a little uncomfortable, so it tells you to stop doing what you are doing because you are hurting, but the truth is, your can take a lot more than you think. Your body is designed to register pain, but in the end if you just decide to call its bluff and listen to your heart (I know, cheesy right?), you can achieve a lot more than you ever thought by breaking this barrier. But then again, that voice is VERY compelling... :)

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